diy solar

diy solar

JBD 4S 200A BMS

If Victron battery minder can't handle 200A and larger loads, then using the JBD BMS 200A seems like it would be ideal to set up for the dual function of a BMS with an additional low cut-off mechanism tossed in. The Mosfets would not demand higher pay just to be more flexible and cut off at a chosen value, following the philosophy of "if it works, it works". Of course you want the next tech who comes along to understand your layout, but if that tech happens to be only you, then forcing each component to only its titled role won't be absolutely necessary.
 
For anyone interested, JiaBaiDa has now also released a 300A version, the SP04S060. This one includes RS485, CAN and a heater port. It also comes with 3 M6 threads for both input and output (unlike the single M6 busbar-style on the 200A version)
Off course it's bigger than the 200A version. (Note: the image I took is in centimeters)
 

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Great I just bought a couple of 200a ones ?. Are they available to the public yet and how much? I just checked the JBD store on Aliexpress but didn't see them.
 
I have bought mine direct from my contact at JiaBaiDa (Alibaba). They should be available, but I don't know about their current stock and how things workout with CNY (which is in 14 days or so)

I don't use Aliexpress for any serious stuff ;)
 
I find the balance wires on the JBD 200A BMS to be extremely sensitive to any movement. As I was installing elements around the lifepo4 system I would get alarms from the BMS for over or under current conditions. This is a few weeks post install. After a lot of trouble-shooting jiggling one of the balance leads restored the readings between two cells. I may have brushed the wire with my hand, but never more than that. Are there heavier duty balance wires available? Am I the only one with this issue? thanks
 
Mongo said:
I find the balance wires on the JBD 200A BMS to be extremely sensitive to any movement. As I was installing elements around the lifepo4 system I would get alarms from the BMS for over or under current conditions. This is a few weeks post install. After a lot of trouble-shooting jiggling one of the balance leads restored the readings between two cells. I may have brushed the wire with my hand, but never more than that. Are there heavier duty balance wires available? Am I the only one with this issue? thanks
Click to expand...

Sounds like you have a bad connection. I suggest you jiggle each wire one by one to find out which. "Heavier duty" balance wires are not what you need to fix your problem.
 
I have had problems getting any wire less than 18-guage to make a good crimp connection. I usually strip twice as long a section as needed for the depth of the terminal and bend it back on itself to double the diameter of the wire. I also use shrink tubing with adhesive over the connection to provide additional strain relieve.
 
hwse said:
I have had problems getting any wire less than 18-guage to make a good crimp connection. I usually strip twice as long a section as needed for the depth of the terminal and bend it back on itself to double the diameter of the wire. I also use shrink tubing with adhesive over the connection to provide additional strain relieve.
Click to expand...

I just bought the correct size crimp connector. I will admit they are difficult to find, and expensive.

CrimpSupply.com | In Stock and Available to Ship Today

A crimpable connectors, tools, cable ties, packard metri pack, weather pack, terminals, truck lighting, shrink tubing and terminal company.
www.crimpsupply.com www.crimpsupply.com

I suggest part number 11A28016.

26-24 Ga. Heat-Shrink Ring Terminals, 1/4" Stud

26-24 Ga. Heat-Shrink Ring Terminals, 1/4" Stud For use in harsh environments, these terminals feature a heat shrink connection that also has an internal sealant. After crimping the terminal onto the wire, simply apply heat. Keeps moisture out while ensur
crimpsupply.com crimpsupply.com

As an alternative, the doubling as you suggest works as well. I did that before I got the correct ring terminals.
 
Last edited:
The balancing wires and connectors are all pre-made with the JBD BMS. There is no strain on the wires. I may need to redo the connector. Thanks
 
Mongo said:
The balancing wires and connectors are all pre-made with the JBD BMS. There is no strain on the wires. I may need to redo the connector. Thanks
Click to expand...
JBD didn't supply already manufactured ring terminals on any BMS that I have purchased from them. Sounds like your vendor did a poor job of testing.
 
Just John said:
I suggest part number 11A28016.
Click to expand...
good find but those are 1/4" - and it's hard to find bigger, in general.
so would need to snip the rings or drill and tap the busbars - which I did anyway ?

edit: you're right - 1/4" should fit m6 ok. I was thinking of another issue, oops
 
Last edited:
pretzel said:
good find but those are 1/4" - and it's hard to find bigger, in general.
so would need to snip the rings or drill and tap the busbars - which I did anyway ?
Click to expand...

Sounds like a very non-standard cell terminal. The one I suggested works well for 1/4 inch or M6.
 
Hi all,
can anyone tell me if there is any reason to prefer JBD app over the Overkill Solar app for monitoring and controlling the JBD BMS?
thanks
 
Mongo said:
Hi all,
can anyone tell me if there is any reason to prefer JBD app over the Overkill Solar app for monitoring and controlling the JBD BMS?
thanks
Click to expand...
Overkill BMSs are JBD.
Overkill is in the USA and they provide very good support.
 
I have two sealed 12v x 480Ah packs that have this 200A JBD BMS and they seem to be completely unable to balance the pack. They are in a sealed case so I cannot open them to do anything to help the balance by charging or discharging individual cells. I have tried charge balance on and off but the low cell never seems to make any gains. If I try to charge them at anything greater than 14.1v I hit OVP with one cell at 3.65 and the low cell still at 3.37.

Any ideas on how to get this pack to balance?
 
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